I think the best way to shut up bitcoin haters is to prove that you are earning on bitcoin. When I was starting at bitcoin, there are a lot of negative comments from my friends and they were always telling me to be cautious. Only a few of them supported me and those people are investing on bitcoin as well. They are earning enough money for their needs and they never regret investing on bitcoin even if the price goes up and down.
Yes that is pretty much true I may not know what is the real reason Behind their hate but the thing is there is nothing they can do about it just prove th that you are correct and they ar wrong because no matter what they say as long as you are gaining that is nothing to.you. they are the one who will feel dumb because they are hating on it rather than taking some opportunity for them to gain too. But they choose to hate so let them hate just ignore them and theu will stop and start to realize what they have missed.